d = {"a":1, "b":2, "c":3}

keys = d.keys();
print(d["a"])
d["a"] = 10
print(d["a"])
d.pop("a")
print(d.get("a"))
print("a" in d)

for key in d:
    print(key)

for value in d.values():
    print(value)

for k, v in d.items():
    print(k, ":", v)
